Lingual orthodontic arch appliance



FIG. 1 is a perspective view of the lingual orthodontic arch appliance design of this invention, depicting the bottom, right side, and front thereof;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left side view thereof, with the right side view being a mirror image;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a lingual orthodontic arch appliance, as shown and described. 